Authorities released a video of the attack that occurred just before 11 a.m. on May 10 in the 200 block of South Central Avenue.
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Police say the suspect walked up to the victim and attacked him.
The victim, a homeless man, suffered serious injuries after being punched repeatedly in the face.
The suspect was described by police as either a white or Hispanic male, 30 to 40 years of age, medium build and clean shaven. He was last seen wearing a black cap, a dark blue tank with white stripes, and khaki-colored pants.
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Anyone with information is urged to call the Glendale Police Department at (818) 548-4911. Those wishing to remain anonymous can call Crime Stoppers at (800) 222-8477.